This is a debug version substitution for the normal client code.
It will directly call the server code so that you can debug the protocol
in a single process.

AutoXDR will also produce template code for the client side main
procedure (*-clmain.c) and the server side implementation procedures
(*-svstub.c).
They are not shown here, but they can be seen by downloading the AutoXDR tarball
and generating the sources.

The following example is from NFSv4 with all but one queued call removed: